f2fs: convert max_orphans to a field of f2fs_sb_info

Previously, we need to calculate the max orphan num when we try to acquire an
orphan inode, but it's a stable value since the super block was inited. So
converting it to a field of f2fs_sb_info and use it directly when needed seems
a better choose.

Signed-off-by: Gu Zheng <guz.fnst@cn.fujitsu.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>

diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
index 2fc3b6b..0d78bbe 100644 (file)
--- a/fs/f2fs/checkpoint.c
+++ b/fs/f2fs/checkpoint.c
@@ -194,23 +194,15 @@ const struct address_space_operations f2fs_meta_aops = {
 
 int acquire_orphan_inode(struct f2fs_sb_info *sbi)
 {
-       unsigned int max_orphans;
        int err = 0;
 
-       /*
-        * considering 512 blocks in a segment 8 blocks are needed for cp
-        * and log segment summaries. Remaining blocks are used to keep
-        * orphan entries with the limitation one reserved segment
-        * for cp pack we can have max 1020*504 orphan entries
-        */
-       max_orphans = (sbi->blocks_per_seg - 2 - NR_CURSEG_TYPE)
-                               * F2FS_ORPHANS_PER_BLOCK;
        mutex_lock(&sbi->orphan_inode_mutex);
-       if (unlikely(sbi->n_orphans >= max_orphans))
+       if (unlikely(sbi->n_orphans >= sbi->max_orphans))
                err = -ENOSPC;
        else
                sbi->n_orphans++;
        mutex_unlock(&sbi->orphan_inode_mutex);
+
        return err;
 }
 
@@ -834,6 +826,14 @@ void init_orphan_info(struct f2fs_sb_info *sbi)
        mutex_init(&sbi->orphan_inode_mutex);
        INIT_LIST_HEAD(&sbi->orphan_inode_list);
        sbi->n_orphans = 0;
+       /*
+        * considering 512 blocks in a segment 8 blocks are needed for cp
+        * and log segment summaries. Remaining blocks are used to keep
+        * orphan entries with the limitation one reserved segment
+        * for cp pack we can have max 1020*504 orphan entries
+        */
+       sbi->max_orphans = (sbi->blocks_per_seg - 2 - NR_CURSEG_TYPE)
+                               * F2FS_ORPHANS_PER_BLOCK;
 }
 
 int __init create_checkpoint_caches(void)

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 1a06f0a..36211cb 100644 (file)
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -414,6 +414,7 @@ struct f2fs_sb_info {
        struct list_head orphan_inode_list;     /* orphan inode list */
        struct mutex orphan_inode_mutex;        /* for orphan inode list */
        unsigned int n_orphans;                 /* # of orphan inodes */
+       unsigned int max_orphans;               /* max orphan inodes */
 
        /* for directory inode management */
        struct list_head dir_inode_list;        /* dir inode list */